Super AntiSpyware

Along with a good AntiVirus, it is a must these days to have a Malware/Worm/Trojan scanner and perform a scan every few days to clean out all those tracking cookies, or other programs that may not be a direct threat to your PC, yet are still harmful and pose security risks.

SuperAntiSpyware is the best I have used and it gets updated daily and best of all, it is FREE! (No need to upgrade to the Pro version as they are the same but the Pro version just has an active scanner which may slow your computer and isn't really necessary to run 2 security programs at the same time, like an Antivirus and SuperAntiSpyware)